Phonograph-reproducer.



PATENTED MAY 19, 1908.

| J. T. MYGIND. PHONOGRAPH REPRODUGER.

APPLICATION FILED JUNE 4, 1907.

W/Z'Nf s 555 JGRGEN TVEDE MYGIND, OF COPENHAGEN, DENMARK.

PHONOG-RAPH-REPBODUCEB.

Specification of Iietters Patent.

Patented May 19, 1908.

Application filed June 1907. Serial No. 377,233.

To all w7zom it may concern:

Be it known that I, JoRGEN TVEDE MY- VGIND, polytechniciao, subject of Denmark,

residing at G]. Kongevej No. 138, Copenhagen, Denmark, have invented new and useful Improvements in Phonograph-Reprorlucers, of Whichthe following is a specifica- The object of the present invention is to make the connection between pin and soundmg membrane of the reproducing-part of Edisons and similar phonographs specially light and of easy movement as well as free from secondary sounds, thereby obtaining a more delicate and purer reproduction than: when using the usual reproducers of this kind.-

The principal feature of the'invention cons'ists in the lever which carries the ,pin, and which is connected to the membrane through a link, being arranged in such a manner that its three points of engagement, viz: the point of contact between the pin and the cylinder, the point of action of the connect,- ing link, and finally the fixed fulcrum of the lever, situated between these two movable points, lie as far as possible in a straight line.

According to the well-known laws of the lever, the aforesaid arrangement affords the most favorable conditions for an easy movement, and consequently a more delicate reproduction may be obtained than by means of the usual form of the lever, .in which the three points in question form the corners of a triangle. Besides this, the invention provides for a suitable suspension of the lever and a certain amount of damp-' 'reproducer, Fig. 2 across section of the lever through the suspension in the fulcrum, Fig. 3-

the placing of the three'points of engagement of the lever on a straight line, and 4 and each a form of the connecting a Fig. l, is a membrane of copper or other suitable material the edge of which is by means of the screw-threaded clamping ring I) firmly wedged in between soft disks 0 of indiarubber, paper or the like.

. d is the external casing to which the funnel (not, shown) is fitted, and which by means of a hin e e supports the usual plate-piece f, the top 0 which is bent back- The natural propensity of this to clap down is counteracted for example by a lug g fitted onto the casing, engaging a pin 71.

A fork piece 2' (see Fig. 1) or two separate pieces j (see Fig. 2) with bearings serve as suspension means for the lever 7r, which is, through thepiece Z, connected to the center of the membrane, and at its opposite end said lever carries the pin m which slides on. the cylinder 11,.

As mentioned above, and as indicated in Fig. 3 the three points of engagement are pilaced as nearly as possible on a straight line.

ereby is also attained the possibility of materially decreasing the bulk of the lever.

In order n to effect a certain amount of dam ing on the connecting link Z so as to avoi deleterious independent motion, it is provided with a lump 0 of sealing wax or shellac or the like fused onto it.

For the same reasonv instead of the usual suspension of the lever by means of a screw the suspension means as shown in Fig; 2 is used, which consists in a piece of wire 1), bent to the shapeof a crank, which is held in place by its own tension. I

Having now particularly described and ascertained the nature of this said invention and in what manner the same is to be performed I declare that what I claim is:

1. A reproducing device for phonographs comprising a casing, a membrane therein, a forked member on the casing having openings therein, a lever, a pin carried by one end of the lever, a link connecting the other end to the membrane, and a wire bent as a crank on which the lever is carried, the ends of said wire assing through the openings in the forked member, and being held in place by its own tension.

- 2. A reproducing device for phonographs comprising a casing, a membrane therein having an eye-bolt thereon, a lever pivoted on the casing, a pin carried by one end of the lever and a bent wire connecting the other end of the lever .to the eye bolt on the membrane, and a mass fused into the bent wire.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JORGEN TVEDE MYGIND.

Witness s:

P. HOFMAN-BANZ, ERNEST BOUTARD. 

